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Christelle Fritz, Olivier Pitois and Michèle Vignes-Adler. Settling of Solid Particles in Plateau Borders and Nodes. Plateau border. Node. Hydrophobic particles are attached to bubble interfaces. Hydrophilic particles are transported through the liquid phase.

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Christelle Fritz, Olivier Pitois and Michèle Vignes-Adler

Settling of Solid Particles in Plateau Borders and Nodes

Plateau border

Node

Hydrophobic particles are attached to bubble interfaces.

Hydrophilic particles are transported through the liquid phase.

Separation of minerals using the flotation technique

The objective of this work is to provide new information on the particle transport on the local scale.

Experiment

Image processing

Plateau border area

Node area

Control of the liquid fraction

foam

DP=rgDh

cell

reservoir

sintered glass plate

Static conditions

« Mobile Pb »

r=600µm

r=500µm

Dh= 7mm

liquid

1 mm

Plateau border section at the cell windows

Particle injection system

« Rigid Pb »

Particles:

spherical glass beads

Diameters:

d = [15µm, 45µm]

Deceleration

Acceleration

,

,

Particle diameter 35 µm, Dt= 640 ms

camera

Boundary conditions

Particle sedimentation

Prospects

« Mobile »

SDS(3g/L)+ Dodecanol (0.01g/L)

hS = 2.10-5 g/s *

q = 55°

« Rigid »

SDS(3g/L)+ Dodecanol (0.1g/L)

hS = 2.10-3 g/s *

v

Collective effects

dlim

* Liquid drainage through aqueous foam: study of the flow on the bubble scale.

JCIS 2004

R

d particle

Giant Plateau border with solid surfaces

r=30 mm

Sedimentation

+

Liquid flow

mobile

rigid

solid

particles : spherical glass beads

Diameters: d = [1.5;5 mm]

Liquid: oil